feat: add node edges

src/gui/network/SocketGraphic.h

@@ -0,0 +1,17 @@
+#pragma once
+#include <QGraphicsItem>
+#include <QPainter>
+
+class SocketGraphic
+: public QGraphicsItem
+{
+public:
+    SocketGraphic(QGraphicsItem *parent = nullptr);
+    QRectF boundingRect() const override;
+
+    void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget) override;
+
+private:
+    int socketSize_ = 1;
+};
+